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m in (-oo:+oo)
(-1/(-3))*m-7 = 5 // - 5
(-1/(-3))*m-7-5 = 0
1/3*m-12 = 0 // + 12
1/3*m = 12 // : 1/3
m = 12/1/3
m = 36
m = 36
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